. . . . . . . . . . "SDN:P01::HGAFAT09" . "The square root of the average of the squares of deviations about the mean of a set of values of the specified measurement."@en . . . . "Hg_aerosol_SD" . . "accepted"@en . "Concentration standard deviation of total mercury {total_Hg CAS 7439-97-6} per unit volume of the atmosphere [aerosol phase]"@en . . . . . . . . .